#!/usr/bin/python
# -*- coding: utf-8 -*-

# This file is part of Cockpit.
#
# Copyright (C) 2015 Red Hat, Inc.
#
# Cockpit is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# Cockpit is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Cockpit; If not, see <http://www.gnu.org/licenses/>.

import parent

from testlib import *
from storagelib import *

@skipImage("UDisks doesn't have support for LVM", "debian-8", "ubuntu-1604")
class TestStorage(StorageCase):
    def testLvm(self):
        m = self.machine
        b = self.browser

        mount_point_one = "/run/one"
        mount_point_thin = "/run/thin"

        self.login_and_go("/storage")
        b.wait_in_text("#drives", "VirtIO")

        m.add_disk("50M", serial="DISK1")
        m.add_disk("50M", serial="DISK2")
        m.add_disk("50M", serial="DISK3")
        b.wait_in_text("#drives", "DISK1")
        b.wait_in_text("#drives", "DISK2")
        b.wait_in_text("#drives", "DISK3")

        dev_1 = "/dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_DISK1"
        dev_2 = "/dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_DISK2"

        # Create a volume group out of two disks
        m.execute("vgcreate TEST1 %s %s" % (dev_1, dev_2))
        b.wait_in_text("#vgroups", "TEST1")
        b.click('tr:contains("TEST1")')
        b.wait_visible("#storage-detail")
        b.wait_in_text("#pvols", "DISK1")
        b.wait_in_text("#pvols", "DISK2")

        # Both of them should be empty and removable
        b.wait_present('#pvols tr:nth-child(1) button[data-action="pvol_remove"]')
        b.wait_present('#pvols tr:nth-child(2) button[data-action="pvol_remove"]')

        # Create two logical volumes
        m.execute("lvcreate TEST1 -n one -L 20m")
        self.content_row_wait_in_col(1, 2, "/dev/TEST1/one")
        m.execute("lvcreate TEST1 -n two -L 20m")
        self.content_row_wait_in_col(2, 2, "/dev/TEST1/two")

        # Deactivate one
        m.execute("lvchange TEST1/one -a n")
        self.content_row_wait_in_col(1, 1, "Inactive volume")
        self.content_row_wait_in_col(1, 2, "one")

        # and remove it
        m.execute("lvremove TEST1/one")
        b.wait_not_in_text("#detail-content", "one")

        # remove a disk from the volume group
        m.execute("pvmove %s &>/dev/null || true" % dev_2)
        m.execute("vgreduce TEST1 %s" % dev_2)
        b.wait_not_in_text("#pvols", "DISK2")

        # The remaining lone disk is not removable
        b.wait_present('#pvols tr:nth-child(1) button[disabled]')

        # Wipe the disk and make sure lvmetad forgets about it.  This
        # might help with reusing it in the second half of this test.
        #
        # HACK - the pvscan is necessary because of
        # https://bugzilla.redhat.com/show_bug.cgi?id=1063813
        #
        m.execute("wipefs -a %s" % dev_2)
        m.execute("pvscan --cache %s" % dev_2)

        # Thin volumes
        m.execute("lvcreate TEST1 --thinpool pool -L 20m")
        self.content_row_wait_in_col(1, 2, "pool")
        m.execute("lvcreate -T TEST1/pool -n thin -V 100m")
        self.content_row_wait_in_col(2, 2, "/dev/TEST1/thin")
        m.execute("dd if=/dev/urandom of=/dev/mapper/TEST1-thin bs=1M count=10 status=none")
        self.content_tab_wait_in_info(1, 1, "Data Used", "50%")
        m.execute("lvremove -f TEST1/thin")
        self.content_tab_wait_in_info(1, 1, "Data Used", "0%")

        # remove the volume group
        b.go("#/")
        b.wait_visible("#storage")
        m.execute("vgremove -f TEST1")
        b.wait_not_in_text("#vgroups", "TEST1")

        # create volume group in the UI
        b.wait_visible('#create-volume-group')

        self.dialog_with_retry(trigger = lambda: b.click('#create-volume-group'),
                               expect = lambda: (self.dialog_is_present('disks', "DISK1") and
                                                 self.dialog_is_present('disks', "DISK2") and
                                                 self.dialog_check({ "name": "vgroup0" })),
                               values = { "disks": { "DISK1": True,
                                                     "DISK2": True }})

        b.wait_in_text("#vgroups", "vgroup0")

        # Check that the next name is "vgroup1"
        b.click('#create-volume-group')
        self.dialog_wait_open()
        self.dialog_wait_val("name", "vgroup1")
        self.dialog_cancel()
        self.dialog_wait_close()

        b.click('tr:contains("vgroup0")')
        b.wait_visible('#storage-detail')

        # create a logical volume
        b.click("a:contains(Create new Logical Volume)")
        self.dialog(expect = { "name": "lvol0" },
                    values = { "purpose": "block",
                               "size": 20 })
        self.content_row_wait_in_col(1, 2, "/dev/vgroup0/lvol0")

        # check that the next default name is "lvol1"
        b.click("a:contains(Create new Logical Volume)")
        self.dialog_wait_open()
        self.dialog_wait_val("name", "lvol1")
        self.dialog_cancel()
        self.dialog_wait_close()

        # try to shrink it without a filesystem.
        self.content_tab_info_action(1, 1, "Size")
        self.dialog_wait_open()
        self.dialog_wait_val("size", 20)
        self.dialog_set_val("size", 10)
        self.dialog_apply()
        self.dialog_wait_error(None, "This logical volume cannot be made smaller.")
        self.dialog_cancel()

        # grow it
        self.content_tab_info_action(1, 1, "Size")
        self.dialog({ "size": 30 })

        # format and mount it
        self.content_tab_action(1, 2, "Format")
        self.dialog({ "type": "ext4",
                      "mounting": "custom",
                      "mount_point": mount_point_one })
        self.content_row_wait_in_col(1, 1, "ext4 File System")
        self.wait_in_storaged_configuration(mount_point_one)
        self.content_tab_action(1, 2, "Mount")
        self.content_tab_wait_in_info(1, 2, "Mounted At", mount_point_one)

        # unmount it
        self.content_tab_action(1, 2, "Unmount")
        b.wait_not_present(self.content_tab_info_row(1, 2, "Mounted At"))

        # shrink it, this time with a filesystem.
        self.content_tab_info_action(1, 1, "Size")
        self.dialog({ "size": 10 })

        # delete it
        self.content_head_action(1, "Delete")
        self.confirm()
        b.wait_not_in_text("#detail-content", "/dev/vgroup0/lvol0")
        self.assertEqual(m.execute("grep %s /etc/fstab || true" % mount_point_one), "")

        # remove disk
        b.wait_present('#pvols tr:nth-child(2) button')
        b.click('#pvols tr:nth-child(2) button')
        b.wait_not_in_text("#pvols", "DISK2")
        b.wait_in_text("#detail-header .info-table-ct", "48 MiB")

        # create thin pool and volume
        # the pool will be maximum size, 48 MiB
        b.click("a:contains(Create new Logical Volume)")
        self.dialog(expect = { "size": 48 },
                    values = { "purpose": "pool",
                               "name": "pool",
                               "size": 38 })
        self.content_row_wait_in_col(1, 2, "pool")

        self.content_row_action(1, "Create Thin Volume")
        self.dialog(expect = { "name": "lvol0" },
                    values = { "name": "thin",
                               "size": 50 })
        self.content_row_wait_in_col(2, 2, "/dev/vgroup0/thin")

        # add a disk and resize the pool
        b.click('[data-action="vgroup_add_disk"]')
        self.dialog_wait_open()
        self.dialog_select('disks', "DISK2", True)
        self.dialog_apply()
        self.dialog_wait_close()
        b.wait_in_text("#pvols", "DISK2")
        b.wait_in_text("#detail-header .info-table-ct", "96 MiB")

        self.content_tab_info_action(1, 1, "Size")
        self.dialog({ "size": 70 })

        # There is not enough free space to remove any of the disks.
        b.wait_present('#pvols tr:nth-child(1) button[disabled]')
        b.wait_present('#pvols tr:nth-child(2) button[disabled]')

        # use almost all of the pool by erasing the thin volume
        self.content_tab_action(2, 2, "Format")
        self.dialog({ "erase": "zero",
                      "type": "ext4",
                      "mounting": "custom",
                      "mount_point": mount_point_thin })
        self.content_row_wait_in_col(2, 1, "ext4 File System")
        self.wait_in_storaged_configuration(mount_point_thin)

        # remove volume group
        b.click_action_btn('.panel-heading:contains("Volume Group") .btn-group', "Delete")
        self.confirm()
        b.wait_visible("#storage")
        self.assertEqual(m.execute("grep %s /etc/fstab || true" % mount_point_thin), "")

if __name__ == '__main__':
    test_main()
